1800

This number is a composite.

Just showing those entries submitted by 'Herrnberger': (Click here to show all)

13+17+31+37+71+73+79+97+107+113+149+157+167+179+199+311 = 2^3*3^2*5^2 is the sum of the first 2^4=4^2 emirps and a powerful number, using the first three primes only. [Herrnberger]